What condition is indicated by a painless limp, thigh muscle atrophy, and limited internal rotation in a child?

The condition indicated by a painless limp, thigh muscle atrophy, and limited internal rotation in a child is Legg-Calve-Perthes Disease. This disease involves a disruption of blood supply to the femoral head, leading to necrosis of the bone and subsequent regeneration of the bone tissue.

One of the hallmark signs of this condition is the painless limp, which often develops gradually over time rather than suddenly. Additionally, as the disease progresses, muscle atrophy may occur due to disuse of the affected leg, and limited internal rotation of the hip is typically observed upon physical examination. This limited motion is due to the changes in the joint and surrounding soft tissues as a result of the disease process.

In contrast, slipped capital femoral epiphysis usually presents with hip or knee pain and may not have muscle atrophy at presentation. Transient synovitis often presents with pain and is associated with inflammation, making it painful, and is typically self-limiting. Osteomyelitis would present with significant fever and localized pain, along with more systemic signs of infection, which does not align with the symptom profile described in this scenario.